Harrington, Washington climate: Normal weather by month, frost dates and records
Harrington's normal year runs from 22°F December nights to 85°F July afternoons, with 12.6 inches of precipitation and 24 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.4°C, December lows of −6°C, July highs of 30°C, 321 mm of precipitation a year.
- NOAA stationHarrington
- Station IDUSC00453515
- Location47.48°N 118.25°W
- Elevation2,159 ft (658 m)
- Population461
On October 23, the normal high in Harrington is 56°F and the normal low 32°F, and the chance of measurable rain or snow is 25%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Harrington.
- Jan 35° 23°
- Feb 41° 25°
- Mar 51° 29°
- Apr 60° 33°
- May 69° 40°
- Jun 75° 44°
- Jul 85° 49°
- Aug 85° 49°
- Sep 76° 42°
- Oct 60° 34°
- Nov 44° 28°
- Dec 34° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Harrington each month?
July is the warmest month, with normal highs of 85°F; December the coldest, with normal lows of 22°F. The most precipitation falls in December (1.79 in), the least in August (0.32 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 23°F | 28.9°F | 1.59 | 7.8 | 10 | <1 | 28 | 8 h 50 min |
| February | 41°F | 25°F | 32.6°F | 1.05 | 3.3 | 8 | <1 | 24 | 10 h 10 min |
| March | 51°F | 29°F | 40.2°F | 1.38 | 1.4 | 10 | <1 | 22 | 11 h 50 min |
| April | 60°F | 33°F | 46.3°F | 0.97 | 0.2 | 7 | <1 | 16 | 13 h 30 min |
| May | 69°F | 40°F | 54.2°F | 1.13 | 0.0 | 7 | <1 | 7 | 15 h |
| June | 75°F | 44°F | 59.8°F | 0.91 | 0.0 | 6 | 2 | 1 | 16 h |
| July | 85°F | 49°F | 67.1°F | 0.37 | 0.0 | 3 | 10 | <1 | 15 h 40 min |
| August | 85°F | 49°F | 66.8°F | 0.32 | 0.0 | 3 | 8 | 1 | 14 h 20 min |
| September | 76°F | 42°F | 59.1°F | 0.43 | 0.0 | 3 | 2 | 3 | 12 h 40 min |
| October | 60°F | 34°F | 47.1°F | 1.16 | 0.1 | 7 | <1 | 15 | 11 h |
| November | 44°F | 28°F | 35.9°F | 1.54 | 3.4 | 11 | <1 | 21 | 9 h 20 min |
| December | 34°F | 22°F | 28.0°F | 1.79 | 7.3 | 10 | <1 | 28 | 8 h 30 min |
| Year (annual) | 60°F | 35°F | 47.2°F | 12.64 | 23.5 | 84 | 21 | 164 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −5°C | −1.7°C | 40 mm | 20 cm |
| February | 5°C | −4°C | 0.3°C | 27 mm | 8 cm |
| March | 11°C | −1°C | 4.6°C | 35 mm | 4 cm |
| April | 15°C | 0°C | 7.9°C | 25 mm | 1 cm |
| May | 21°C | 4°C | 12.3°C | 29 mm | 0 cm |
| June | 24°C | 7°C | 15.4°C | 23 mm | 0 cm |
| July | 30°C | 9°C | 19.5°C | 9 mm | 0 cm |
| August | 30°C | 9°C | 19.3°C | 8 mm | 0 cm |
| September | 24°C | 6°C | 15.1°C | 11 mm | 0 cm |
| October | 16°C | 1°C | 8.4°C | 29 mm | 0 cm |
| November | 7°C | −2°C | 2.2°C | 39 mm | 9 cm |
| December | 1°C | −6°C | −2.2°C | 45 mm | 19 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00453515; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Harrington?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (3).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00453515.
When is the last frost in Harrington?
In Harrington, the last spring frost (32°F) comes after May 31 in half of years and after June 28 in one year in ten; the first autumn frost comes before September 12 in half of years and before August 23 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 311 year in 10 after June 28; 9 in 10 after May 10
- First autumn frost, half of years before
- September 121 year in 10 before August 23; 9 in 10 before October 2
NOAA puts the median frost-free season at 101 days, and the season without a hard freeze (28°F) at 142 days.
A hard freeze (28°F) comes after May 9 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Harrington in zone 6b in ZIP code 99134, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Harrington's NOAA station is in zone 6a: the coldest night of a typical year reaches −6°F (24 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00453515; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Harrington?
In a normal year in Harrington, 21 days a year reach 90°F (1 of them 100°F or more), 164 nights fall to 32°F or colder and 84 days bring measurable precipitation.
- Days at 90°F or more
- 21a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 164a normal year
- Days that stay below freezing
- 33high of 32°F or less
- Days with 0.01 inch of precipitation
- 84a normal year
- Days with 1 inch of snow or more
- 11a normal year
The highest temperature in this station's record (since 1961) is 106°F, on June 28, 2015; the lowest is −27°F, on February 2, 1996.
The wettest calendar year on that record is 1996, with 18.83 in; the snowiest season is 1968–69, with 59.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00453515; records: ACIS (NOAA Regional Climate Centers), station USC00453515. Records use complete months only; a month missing more than three days is left out.
How sunny is Harrington?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Harrington, 4.1 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (53%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 55% | 1.1 |
| February | 69% | 2.3 |
| March | 71% | 3.5 |
| April | 78% | 5.2 |
| May | 80% | 6.4 |
| June | 81% | 7.0 |
| July | 92% | 7.5 |
| August | 91% | 6.3 |
| September | 86% | 4.6 |
| October | 78% | 2.9 |
| November | 64% | 1.5 |
| December | 53% | 0.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Harrington need?
A normal year in Harrington brings 6,768 heating degree days, 26% more than the median U.S. place (5,373), and 290 cooling degree days, 68% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,895 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,119 | 0 |
| February | 906 | 0 |
| March | 770 | 0 |
| April | 561 | 0 |
| May | 340 | 5 |
| June | 184 | 27 |
| July | 53 | 118 |
| August | 56 | 114 |
| September | 205 | 26 |
| October | 557 | 1 |
| November | 872 | 0 |
| December | 1,145 | 0 |
| Year (annual) | 6,768 | 290 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00453515. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Harrington been warmer than normal lately?
Over 47 complete years from 1962 to 2019, the station's annual mean temperature rose at a fitted 2.2°F per century (+0.12°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Harrington's climate compare?
Harrington is warmer than 13 of the other 95 places with their own NOAA record in Washington, and wetter than 23. Across the 7,247 U.S. stations with normals, its annual mean of 47.2°F is warmer than 29%.
In the Köppen classification computed from these normals, Harrington is Dsb: continental, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Harrington share this climate record?
Sprague has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Sprague, WA525 people · 18 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Harrington's climate
What is the coldest month in Harrington?
December, with a normal high of 34°F and a normal low of 22°F. The warmest is July (85°F by day, 49°F at night).
Does it snow in Harrington?
Yes: 24 inches in a normal year, falling on 18 days with 0.1 inch or more, the most in January (7.8 inches).
What is the rainiest month in Harrington?
December, with 1.79 in of precipitation in a normal year; the driest is August with 0.32 in.
What plant hardiness zone is Harrington in?
The USDA's 2023 map puts Harrington in zone 6b in ZIP code 99134, the nearest ZIP area. By the same method at Harrington's NOAA station, the coldest night of a typical year reaches −6°F (24 years, 1991-2020): zone 6a.
How late can frost come in Harrington?
In half of years the last 32°F night comes after May 31; in one year in ten it comes after June 28. Waiting until June 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Davenport, WA13 miles from this station, 44.5°F a year
- Odessa, WA23 miles from this station, 48.8°F a year
- Ritzville, WA26 miles from this station, 48.7°F a year
- Wilbur, WA30 miles from this station, 45.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made